Acquisition Hardware; Sampling Process; Figure 3- 9: Digitizer Configuration; Figure 3- 10: Digital Acquisition - Sampling And Digitizing - Tektronix TDS5052 User Manual

Acquiring Waveforms

Acquisition Hardware

Sampling Process

3- 30
Before a signal can be acquired, it must pass through the input channel where it
is scaled and digitized. Each channel has a dedicated input amplifier and digitizer
as shown in Figure 3- -9; each channel can produce a stream of digital data from
which the oscilloscope extracts waveform records. Refer to Signal Connection
and Conditioning on page 3- -4 for further description of scaling, positioning,
and DC offsetting of channels.
CH 1
CH 2
CH 3
CH 4

Figure 3- 9: Digitizer configuration

Acquisition is the process of sampling an analog signal, converting it into digital
data, and assembling it into a waveform record, which is then stored in acquisi-
tion memory. Sampling, then, is the process that provides a waveform record per
trigger event (see Figure 3- -11 on page 3- -32). The signal parts within the vertical
range of the amplifier are digitized. See Figure 3- -10.
Input signal
Figure 3- 10: Digital acquisition — sampling and digitizing
Digitizer
Digitizer
Digitizer
Digitizer
Sampled points
+5.0 V +5.0 V
0 V 0 V 0 V 0 V
- - 5.0 V - - 5.0 V
Digital values
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